FBK04F12U is a 12 Vdc fan from NMB Technologies Corporation that has gone obsolete. P14674-ND from NMB Technologies Corporation has been offered as a possible substitute.
To verify this part will work in your application or to view full specifications see the manufacturer datasheet. https://media.digikey.com/pdf/Data%20Sheets/NMB-MAT/04020VA.pdf